I haven't been having much luck with sentai either. Basically since Timeranger, it's been a crapshoot. Gao was just okay, then sentai got better until it peaked at Deka. Then it fell off and aside from Gekiranger I haven't been able to enjoy anything in the last seven years. It's pretty maddening stuff considering how much and how long I've loved sentai.
Magi was overexperimental and had the most insufferable red ever, Bouken was an amazing storm of potential thrown out of the window Kabuto-style, Go-Onger went full retard, the Shinkenger team is both
scary as hell and unreleatable to me as a foreigner, and Gosei... I'm sorry,
Gosei wtf.
Sentai's starting to feel like Heisei Rider, except without the parts where it just all clicks and sitting through 20+ bland episodes suddenly becomes "worth it." Say what you will about PR, but I usually at least can turn to that when I want to see a story about non-confusing people saving the world.
The mecha's getting worse, too--though oddly enough, I liked what I saw of Gosei's mecha in the early episodes. (I actually like the Headder attachments.) I haven't seen whether or not the arsenal's gotten better or worse, though.
EDIT:
Well, alright then. This seems a problem easily solvable by watching old Super Sentai and at least keeping up with the new to see if something you might like will eventually pop up.
Yeah, I've been resorting to this. Gave Jetman a try recently. 4 episodes in and I'm loving the heck out of it.